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কোন এনজাইমের সাহায্যে প্লাজমিড ডি. এন. এ কে ছেদন করা হয়?

Amylase enzyme

Protease enzyme

Cellulose enzyme

Restriction enzyme

ANSWER : 4

Descrption

A restriction enzyme, restriction endonuclease, or restrictase is an <a title = "Enzyme" href = "https://en.wikipedia.org/wiki/Enzyme">enzyme</a> that cleaves <a title = "DNA" href = "https://en.wikipedia.org/wiki/DNA">DNA</a> into fragments at or near specific recognition sites within molecules known as <a title = "Restriction site" href = "https://en.wikipedia.org/wiki/Restriction_site">restriction sites</a>Restriction enzymes are one class of the broader <a title = "Endonuclease" href = "https://en.wikipedia.org/wiki/Endonuclease">endonuclease</a> group of enzymes. Restriction enzymes are commonly classified into five types, which differ in their structure and whether they cut their DNA <a title = "Enzyme substrate (biology)" href = "https://en.wikipedia.org/wiki/Enzyme_substrate_(biology)">substrate</a> at their recognition site, or if the recognition and cleavage sites are separate from one another. To cut DNA, all restriction enzymes make two incisions, once through each <a title = "Backbone chain" href = "https://en.wikipedia.org/wiki/Backbone_chain">sugar - phosphate backbone</a> of the <a title = "DNA double helix" href = "https://en.wikipedia.org/wiki/DNA_double_helix">DNA double helix</a>

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